An Investigate of the Effect of Manufacturing Parameters on the Mechanical Properties of Thermoplastic Composites

Fiber impregnation has been the main obstacle for thermoplastic matrix with high viscosity. This problem could be surmounted by adapting low viscous polymeric precursors Woven basalt fabric reinforced poly (butylenes terephthalate) composites were produced via in-situ polymerization at T=210°C. Before polymerization, catalyst was introduced to the reinforcement surface with different concentration. DSC is used to determine the polymerization and crystallization. SEM is used to detect whether the catalyst existed on surface. Both flexural and short-beam shear test are employed to study the corresponding mechanical properties.

Download Full-text

Mechanical Properties of Silk Fiber Reinforced Thermoplastic Composites

Design, Manufacturing and Applications of Composites ◽

10.1201/9781003072089-19 ◽

2020 ◽

pp. 122-129

Author(s):

T. Kimura ◽

S. Katori ◽

K. Hanada ◽

S. Hatta

Keyword(s):

Mechanical Properties ◽

Silk Fiber ◽

Thermoplastic Composites ◽

Fiber Reinforced

Download Full-text

Mechanical Properties of Compression Moulded Aggregate-Reinforced Thermoplastic Composite Scrap

Journal of Composites Science ◽

10.3390/jcs5110299 ◽

2021 ◽

Vol 5 (11) ◽

pp. 299

Author(s):

Julien Moothoo ◽

Mahadev Bar ◽

Pierre Ouagne

Keyword(s):

Mechanical Properties ◽

Tensile Properties ◽

Test Method ◽

Thermoplastic Composite ◽

Recycled Aggregate ◽

Thermoplastic Composites ◽

Mechanical Recycling ◽

Compression Moulding ◽

Grain Sizes ◽

Recycled Composites

Recycling of thermoplastic composites has drawn a considerable attention in the recent years. However, the main issue with recycled composites is their inferior mechanical properties compared to the virgin ones. In this present study, an alternative route to the traditional mechanical recycling technique of thermoplastic composites has been investigated with the view to increase mechanical properties of the recycled parts. In this regard, the glass/polypropylene laminate offcuts are cut in different grain sizes and processed in bulk form, using compression moulding. Further, the effect of different grain sizes (i.e., different lengths, widths and thicknesses) and other process-related parameters (such as mould coverage) on the tensile properties of recycled aggregate-reinforced composites have been investigated. The tensile properties of all composite samples are tested according to ISO 527-4 test method and the significance of test results is evaluated according to Student’s t-test and Fisher’s F-test respectively. It is observed that the tensile moduli of the recycled panels are close to the equivalent quasi-isotropic continuous fibre-reinforced reference laminate while there is a noteworthy difference in the strengths of the recycled composites. At this stage, the manufactured recycled composites show potential for stiffness-driven application.

Download Full-text

Stiffness prediction of 3D printed fiber-reinforced thermoplastic composites

Rapid Prototyping Journal ◽

10.1108/rpj-11-2018-0283 ◽

2019 ◽

Vol 26 (3) ◽

pp. 549-555

Author(s):

Jin Young Choi ◽

Mark Timothy Kortschot

Keyword(s):

Mechanical Properties ◽

Extrusion Direction ◽

Analytical Models ◽

Thermoplastic Composites ◽

Fiber Reinforced ◽

Flat Plates ◽

Fused Filament Fabrication ◽

Element Analysis ◽

Content Type ◽

3D Printed

Purpose The purpose of this study is to confirm that the stiffness of fused filament fabrication (FFF) three-dimensionally (3D) printed fiber-reinforced thermoplastic (FRP) materials can be predicted using classical laminate theory (CLT), and to subsequently use the model to demonstrate its potential to improve the mechanical properties of FFF 3D printed parts intended for load-bearing applications. Design/methodology/approach The porosity and the fiber orientation in specimens printed with carbon fiber reinforced filament were calculated from micro-computed tomography (µCT) images. The infill portion of the sample was modeled using CLT, while the perimeter contour portion was modeled with a rule of mixtures (ROM) approach. Findings The µCT scan images showed that a low porosity of 0.7 ± 0.1% was achieved, and the fibers were highly oriented in the filament extrusion direction. CLT and ROM were effective analytical models to predict the elastic modulus and Poisson’s ratio of FFF 3D printed FRP laminates. Research limitations/implications In this study, the CLT model was only used to predict the properties of flat plates. Once the in-plane properties are known, however, they can be used in a finite element analysis to predict the behavior of plate and shell structures. Practical implications By controlling the raster orientation, the mechanical properties of a FFF part can be optimized for the intended application. Originality/value Before this study, CLT had not been validated for FFF 3D printed FRPs. CLT can be used to help designers tailor the raster pattern of each layer for specific stiffness requirements.

Download Full-text

Mechanical properties of wollastonite reinforced thermoplastic composites: A review

Polymer Composites ◽

10.1002/pc.25403 ◽

2019 ◽

Vol 41 (2) ◽

pp. 395-429 ◽

Cited By ~ 4

Author(s):

Jia X. Chan ◽

Joon F. Wong ◽

Azman Hassan ◽

Zurina Mohamad ◽

Norhayani Othman

Keyword(s):

Mechanical Properties ◽

Thermoplastic Composites

Download Full-text

Characterization and Numerical Modelling of Through-Thickness Metallic-Pin-Reinforced Fibre/Thermoplastic Composites under Bending Loading

Journal of Composites Science ◽

10.3390/jcs4040188 ◽

2020 ◽

Vol 4 (4) ◽

pp. 188

Author(s):

Holger Böhm ◽

Hailun Zhang ◽

Benjamin Gröger ◽

Andreas Hornig ◽

Maik Gude

Keyword(s):

Mechanical Properties ◽

Numerical Modelling ◽

Matrix Cracking ◽

Thermoplastic Composites ◽

Continuum Damage Mechanic ◽

Damage Mechanic ◽

Hybrid Yarn ◽

Cohesive Zone Modelling ◽

Delamination Resistance ◽

Plane Direction

Through-Thickness Reinforcement (TTR) technologies are well suited to improving the mechanical properties in the out-of-plane direction of fibre-reinforced composites. However, besides the enhancement of delamination resistance and thus the prevention of overall catastrophic failure, the presence of additional reinforcement elements in the composite structure affects also the mechanical properties in in-plane direction. In this work, the flexural behaviour of a glass-polypropylene (GF/PP) hybrid yarn-based composite with TTR in form of metallic pins has been investigated experimentally and numerically. The insertion of the metallic pins is realized via thermoactivated pinning technology (TAP). In four-point-bending tests, it is shown that the flexural stiffness and strength decreases with an increase of the overall pin density. Hereby, it is observed that the pins act as crack initiators. For numerical modelling on specimen level, a continuum damage mechanic (CDM) model is used to predict the nonlinear deformation response of the composite, as well as fibre fracture and matrix cracking. A debonding and slipping phenomena of the pin in the composite is modelled by a cohesive zone modelling approach for the interface between pin and composite.

Download Full-text

High flow compression molding for recycling discontinuous long fiber thermoplastic composites

Journal of Composite Materials ◽

10.1177/0021998320913625 ◽

2020 ◽

Vol 54 (23) ◽

pp. 3343-3350

Author(s):

Éric Léger ◽

Benoit Landry ◽

Gabriel LaPlante

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Compression Molding ◽

High Flow ◽

Low Flow ◽

Thermoplastic Composites ◽

Direction Parallel ◽

Significant Difference ◽

Long Fiber Thermoplastic ◽

Flow Compression

An investigation into high flow compression molding for recycling thermoplastic discontinuous long fiber composites is presented. High flow recycled panels and conventional low flow baseline panels were produced with a large rectangular (2:1 aspect ratio) mold. Flow was induced in the recycled panels by stacking cut sections of conventionally produced baseline panels in the center of the mold cavity, representing 25% initial coverage. High flow compression molded panels were found to exhibit significantly higher than baseline tensile strength (+50%) and modulus (+31%) when tested in the direction parallel to flow. When tested in the direction perpendicular to flow, the opposite effect was found, with reductions in tensile strength (−42%) and modulus (−37%). However, when the average results of both directions are compared to baseline, no significant difference was found between the recycled and baseline panels. This severe anisotropic redistribution of mechanical properties suggests chip orientation is affected by flow. Additionally, micrographic analysis revealed that high flow molding induces intra-ply chip shearing and a reduction in resin rich regions within panels. Baseline panels also exhibited in-plane anisotropy, despite initial random distribution of chips and no or near no flow induced during molding. In this case, mechanical properties favored the direction perpendicular to that of the recycled panels.

Download Full-text